Incommensurate spin correlations in highly oxidized cobaltates La2-xSrxCoO4
2016 | journal article. A publication with affiliation to the University of Göttingen.
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Incommensurate spin correlations in highly oxidized cobaltates La2-xSrxCoO4
Li, Z. W.; Drees, Y.; Kuo, C. Y.; Guo, H.; Ricci, A.; Lamago, D. & Sobolev, O. et al. (2016)
Scientific Reports, 6 art. 25117. DOI: https://doi.org/10.1038/srep25117
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Details
- Authors
- Li, Z. W.; Drees, Y.; Kuo, C. Y.; Guo, H.; Ricci, A.; Lamago, D.; Sobolev, Oleg; Ruett, Uta; Gutowski, Olof; Pi, T. W.; Piovano, A.; Schmidt, W.; Mogare, K.; Hu, Z.; Tjeng, L. H.; Komarek, A. C.
- Abstract
- We observe quasi-static incommensurate magnetic peaks in neutron scattering experiments on layered cobalt oxides La2-xSrxCoO4 with high Co oxidation states that have been reported to be paramagnetic. This enables us to measure the magnetic excitations in this highly hole-doped incommensurate regime and compare our results with those found in the low-doped incommensurate regime that exhibit hourglass magnetic spectra. The hourglass shape of magnetic excitations completely disappears given a high Sr doping. Moreover, broad low-energy excitations are found, which are not centered at the incommensurate magnetic peak positions but around the quarter-integer values that are typically exhibited by excitations in the checkerboard charge ordered phase. Our findings suggest that the strong inter-site exchange interactions in the undoped islands are critical for the emergence of hourglass spectra in the incommensurate magnetic phases of La2-xSrxCoO4.
- Issue Date
- 2016
- Status
- published
- Publisher
- Nature Publishing Group
- Journal
- Scientific Reports
- ISSN
- 2045-2322